Another thing i’am using Windows media player to ripp my cd’s in quality WMA lossless

On my system, I always use images that are perfectly square.  I may have made an exception or two and imported for instance 500x499 once —maybe twice— only because I was not able to find anything else on the internet. I add the images to the songs using iTunes (also known as Apple Music). The representation on the BS5 is always that of a perfect square, using this procedure.

And how do I do it?

But the thing is that I can put the image, and it appears on the Beosound 5 screen, put it appears distorted (like in low quality) eaven if I saved a 1000x1000 album cover

I am not familiar with Windows Media Player. On iTunes, here is how I do it: once I have extracted the music from the CD and iTunes has completed all of the metadata, I select all the songs in the album and ⌘i (command-I), which is equivalent to the menu item > Song > Get info… On the dialog window which appears, I select the tab “artwork”.  And then I choose “Add Artwork” and select the square image I have saved somewhere in my disk. It works perfectly every time.